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toolboxchev · 02-15-2019, 03:21 PM

So I found this interesting:

Here from Chevrolet Performance are these replacement partial engines for all ZZZ through ZZ4 series crate engines. These partial engines consist of cast iron 4-bolt mains with 1-piece rear main seals. Inside you have Forged 1053 steel internally balanced crankshafts, 5.7 in. powdered metal connecting rods with hypereutectic flat top pistons with offset pins. These are the same pins used in Corvette LT1 engines. Also included are rings, bearings and brass freeze plugs already installed. Does not include camshafts, timing chains, sprockets, front covers, oil pumps, oil pans, balancers, or flex plates. Compression ratios depend upon the combustion chamber size of the cylinder heads you use. Approximate compression ratios would be 10.0:1 with 58cc, 9.8:1 with 62cc, 9.6:1 with 64cc, and 8.5:1 with 76cc cylinder heads.

What does having offset pins compare with an L31 R Long Block assembly? Granted all pistons are not the same and as I dig the confusion grows! I am getting serious about this and do not wish to travel down a road blindly.

If someone with some engine building experience could chime in and shed some light I would appreciate it!

02-15-2019, 03:21 PM	#7
toolboxchev Registered User Join Date: Jul 2015 Location: 2nd left past the stump on a dirt road. Posts: 2,629	Re: L31R complete or ZZ4 short block So I found this interesting: Here from Chevrolet Performance are these replacement partial engines for all ZZZ through ZZ4 series crate engines. These partial engines consist of cast iron 4-bolt mains with 1-piece rear main seals. Inside you have Forged 1053 steel internally balanced crankshafts, 5.7 in. powdered metal connecting rods with hypereutectic flat top pistons with offset pins. These are the same pins used in Corvette LT1 engines. Also included are rings, bearings and brass freeze plugs already installed. Does not include camshafts, timing chains, sprockets, front covers, oil pumps, oil pans, balancers, or flex plates. Compression ratios depend upon the combustion chamber size of the cylinder heads you use. Approximate compression ratios would be 10.0:1 with 58cc, 9.8:1 with 62cc, 9.6:1 with 64cc, and 8.5:1 with 76cc cylinder heads. What does having offset pins compare with an L31 R Long Block assembly? Granted all pistons are not the same and as I dig the confusion grows! I am getting serious about this and do not wish to travel down a road blindly. If someone with some engine building experience could chime in and shed some light I would appreciate it!